Of course not. They wouldn’t have had any reason to switch.
Of course they would? Millions of euros of tax revenue sounds like a pretty compelling reason to me. This is why Micro$oft’s “lobby efforts” should be labeled as what they are: Nothing more and nothing less than corruption.
It takes more maintenance than Windows.
If you create your own distro, yes. But there are countless noob-friendly distros like Mint, Ubuntu and Fedora that they could use with practically 0 maintenance required. Also, compare the 2004 desktop Linux experience to now. Having used Gentoo Linux compiled from a stage 1 tarball back in 2002, I can tell you: the differences are tremendous. Many of the issues they had can be directly attributed to OpenOffice and it’s bad compatibility with Microsoft Office file formats, which has long been replaced by LibreOffice. It still worked out pretty well for them, over a period of 13 years. And it saved the tax payer millions of euros of Microsoft’s stupid licensing fee for their crappy proprietary garbage.
Basically everyone in the community agrees that Mint, Ubuntu and Fedora are the best choices for new users. Mint and Ubuntu are pretty similar, so they don’t require separate maintenance effort, and supporting Fedora is not that hard, if you already support RHEL, CentOS or another rpm-based distro (which are pretty common in the enterprise space). For all the desktop applications, Flatpak exists and is agreed on as the standard format by most of the desktop Linux community.